The filename in Chinese can not be display in Blender 2.8 when file explore in open
The default font used for the interface does not contain all characters, Chinese is one of them.

There are two options to solve this in the preferences (Edit > Preferences)


Activate Translation  and set language to Simplified Chinese or Traditional Chinese. It may also work with Automatic depending on your OS language configurations.
Choose a different Interface Font for the interface which includes Chinese characters.


I think the first option is likely the best for your problem. Optionally you can also activate the checkmark next to Interface in the translation options to switch the entire interface to Chinese.